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3.2.7 UPLINK MSP CHANNEL 7
(Reserved for response to air-to-ground service request)
The description of this channel has not yet been developed.
3.2.8 UPLINK MSP CHANNEL 8
(Reserved for trajectory negotiation)
The description of this channel has not yet been developed.
3.2.9 UPLINK MSP CHANNELS 9 TO 63
These channels have not been assigned.
3.3 DOWNLINK MSP CHANNELS
The following sections are numbered 3.3.X, where " X is the decimal number equivalent to the downlink MSP channel number.
This is done to allow definilions of ~ h hci lherlo undefined formats to be inserted without affecting paragraph numbers.
3.3.1 DOWNLINK MSP CHANNEL 1
(Reserved for specific services management)
The description of this channel has not yet been developed.
This channel has not been assigned.
3.3.3 DOWNLINKM SP CHANNEL 3
Dataflash is a service which announces the availability of information from air-to-ground on an event-triggered basis. When
implemented, bit 31 of the register accessed by BDS code l,D shall be set to a 1.
28/11/02
No. 77
Annex I0 - Aeronautical Telecommunications Volume I11
Note.- This is an efficient means of downlinking i~zfornzationw hich changes occasionally and unpredictably.
3.3.3.2 SERVICE IN!T/ATION AND TERMINATION
3.3.3.2.1 The dataflash service shall be initiated or discontinued by a service rcquest and is received on uplink MSP channel
6 with a decimal value of ONE in the service request (SR) header, which is contained in the first byte of the user data field. This
indicates that the rest of the user data field shall contain a dataflash request. On the receipt of such a request, a dataflash message
from the register concerned with the request shall immediately be made available and announced to the ground regardless of the
setting of the RDS Reld in the contract request and of any event criteria. The response shall be as follows.
3.3.3.2.2 When lhe requested register is being serviced, the conlract shall be established and an MSP packet as specified in
Table 3-2 shall be announced to the ground on MSP channel 3. The CI field must be set to a value of 1. The message shall be used
by the ground system to confirm that the service has been initiated.
3.3.3.2.3 If the requested register is not being serviced, the contract shall not be established. This shall be indicated by
announcing the MSP packet on downlink MSP channel 3 to the ground containing only bits 1 to 40 as specified in Table 3-2, and
with a value of 2 in the CI Reld.
3.3.3.2.4 If the maximum number of contracts that can be supported are already established, then the new contract shall be
refused. This shall be indicated by announcing to the ground an MSP packet on downlink channel 3, as specified in Table 3-2, and
with a value of 3 in the CI field.
3.3.3.2.5 'In the case of a request from the ground to terminate the service for a particular register, the termination of the service
shall be confirmed by announcing to the ground an MSP packet on downlink channel 3, as shown in Table 3-2, and with a value
of 4 in the CI field.
3.3.3.2.6 In the case of a request from the ground to terminate the service for all contracts to a particular I1 code, the
termination of the service shall be confirmed by announcing to the ground an MSP packet on downlink channel 3, as shown in
Table 3-2, and with a value of 5 in the CI field.
3.3.3.2.7 When the transponder register service fails for an established contract, the contract shall be terminated by the airborne
application. This will be indicated by announcing to the ground an MSP packet on the downlink channel 3, as shown in Table 3-2,
and with a value of 7 in the CI field. Transponder register service shall be deemed to have failed when any of the parameters
specified to be monitored in the ncgotiation of the contract are not being updated at the specified minimum rate.
3.3.3.2.8 Whcn a contract is refused due to an invalid value of the EC field in the contract request, this shall be indicalcd by
announcing to the ground an MSP packet on downlink channel 3, as shown in Table 3-2, and with a value of 15 in the CI field.
3.3.3.2.9 If any message is not exlracted from the transponder by a ground interrogator within 30 seconds, the aircraft
subnetwork shall cancel the message and generate a delivery failure nolice (i.e. the Tz timer expires), which shall be delivered to
the aircraft MSP service provider. When a delivery failure notice is received the service shall be automatically terminated by the
dataflash funclion with no indication to the ground system.
Note.- This is to prevent the transponder message queues being blocked when the ground in,terrogator stops supplying the
message extraction service, either due to a fault or loss of cover: It is the responsibility of the ground application to monitor the
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